knight



(No Model.)

D. PARKHURST.

HEAD BLOCK FOR SAW MILLS.

Patentd Apr. 15, 1884.

NIIED TATES arise. I

Farsi DARIUS PARKH'URST, OF ST. LOUIS,

TO GEO. H. KNIGHT, OF SAME PLACE.

H EAD-BLOCK FOR SAW-MILLS.

SPECIFICATION forming part of Letters Patent No. 296,999, dated April 15, 188%.

Application filed August 20, 1883. (X model.)

To a whom it may concern:

Be it known that I, DARIUS PARKHURST, of

- the city of St. Louis, in the State of Missouri,

kinds of head-blocks for the purpose of receding or bringing back the knees to receive a fresh log by the movement of the carriage as it is run back after the last out has been made.

'My invention consists in features of novelty hereinafter fully described, and pointed out in the claims.

Referring to the drawings, A represents the carriage; B, the track O, the knees of the head-block, and D the main shaft, which is geared with the knees, as usual, all of which may be of any common or well-known construction. l

Grepresents a frame secured to the carriage, and which may act as the frame for setworks. In this frame is journaled acountershaft, H, which has gear-connection with the main shaft, as shown in Fig. 1.

I represents a shaft journaled by means of suitable boxes to the carriage. On this shaft is rigidly secured a cog-wheel, J, and a sprocket or chain wheel, J, the latter of which is connected to a similar wheel, H, on the counter-shaft II by means of an endless chain, K; or, instead of chain and chain-wheels being used, pulleys and belt may be used. The shaft I has hinged to it and also supports one end of a frame, L, in the other end of which is journaled a short shaft, M, to which 'is rigidly secured a friction pulley or wheel, N, and a cog-wheel, O, the latter of which meshes into the wheel J on the shaft I, and the friction pulley or roller is located over the track, so that by being pressed down upon the track when the carriage is being run back it will turn its shaft, and through the described connection turn the main shaft backward, causing the knees to recede, for the purpose stat-ed. As a means for pressing the friction-roller down upon the track, I have showna lever, P, rigidly secured to one end of a shaft, Q, journaled in boxes secured to the carriage. On this end of the shaft is also rigidly secured a crank, R, which is connected to the shaft of the friction-wheel by means of a yoke, S. (See Figs. 8, 4, and 5.) It will thus be seen that by pressing on the free end of the lever the friction-roller will be forced down upon the track, and when the free end of the lever is raised the wheel will be lifted off the track, so as not to cause unnecessary friction' by being in contact with the track when not in use.

A spring, T, secured to the carriage, and upon which the lever rests, is employed to sustain the wheel and hold it out of contact with the track. (See Fig. 2.)

I provide the free end of the lever with an arm, U, having a step, U, to receive a foot of the operator.

V represents a platform on which the operator stands.

Instead of the friction roller or wheel N and the cog-wheel 0 being rigidly secured to their shaft, they may be cast or secured together, and then they would be loose upon the shaft, and the same may be said of the wheels J and J on the shaft I.

I claim as myinvention 1. The combinatiom'with a carriage, a setworks counter-shaft, a chain-wheel on the counter-shaft, a friction-roller, and means for raising and lowering the friction-roller, of the intermediate shaft secured to the carriage, cog-wheel and chain-wheel on the in= termediate shaft, yoke secured to the means for raising and lowering the friction-roller,

shaft supported by the yoke, and on which the friction-roller is mounted, cog-wheel on the yoke-shaft, and frame hinging the yokeshaft to the intermediate shaft, as set forth.

2. The eembinatien, with a carriage, a setmounted, cog-Wheel on the yoke-shaft, and works counter-shaft, a chain-Wheel on the frame hinging the yoke-shaft t0 the interme- 10 counter-shaft, a friction-when and a shai't 5 diate shaft, as set forth. having 3 erank, ot: the intermediate ehai't se- 1 DARIUS PARKHURST cured to the ezu'rmge, Gog-Wheel and chamwheel on the intermediate shaft, yoke se-l In presence of' cured to the crank, shaft supported by the I GEO. H. KNIGHT, yoke, and on which the friction-roller is J. E. KNIGHT. 

